Abstract:

The effects of soil temperature on soil respiration in natural forest of Picea crassifolia were evaluated by using the Li-6400-09 soil respiration rate apparatus. The results indicated that during the growth phase of P. crassifolia, both the soil respiration and temperature were all in a single apex curve which reached summit in July. Furthermore, the soil respiration was positively correlated to temperatures in the forest and on the ground surface(from the surface to 10 cm depth), and the corrections could be described by linear regression equations. Thirdly, temperature was the major factor that affected the soil aspiration before the month of utmost rainfall. Concerning the correlations between soil temperature and soil aspiration, the surface temperature was positively related to soil aspiration (R²=0.841 4), and the pertinence reduced with depth adding until the pertinence was minimized at 10 cm depth; In the end, according to air temperature and soil temperature(0, 5 and 10 cm) in Picea crassifolia forest,the index of Q¹⁰ was calculated which were 1.55, 1.20,1.42 and 1.65.

Key words: temperature change, soil respiration, Picea crassifolia forest